How to defend myself in a fight?

Well, I know this sounds fake but I swear this is true. Cheerleading and Basketball is happening at the same gym because it is hugee! so my ex really hates me and he said that he's going to hit me in the face with a bball mess me up on cheerleading, and he said hes going to "make my white azz face black so dont even come tuesday night". WHICH IS TOMMRROW! are there any good comebacks and anyways to fight without maing myself look stupid, also i have some tough azz cheerleaders and some of them say they got my back which they do. PLEASE HELP I WANT MY FACE THE WAY ITS SUPPOSE TO BE D: